Show HN: Algorithms and Data Structures in TypeScript – Free Book (~400 Pages)

64 points by jsontwikkeling 7 hours ago on hackernews | 20 comments
I started writing this book 10 years ago in JavaScript, got through a few chapters (asymptotic notation, basic techniques, start of sorting), and then abandoned it.

Recently I picked it back up, converted everything to TypeScript, and used AI (Zenflow [1] + Claude Opus 4.6) to complete the remaining chapters. I provided the structure, direction, and initial chapters; the AI generated the bulk of the remaining content under a spec-driven workflow.

The book covers roughly a first 1-2 year CS curriculum: sorting, dynamic programming, graph algorithms, trees, heaps, hash tables, and more. All code is executable, typed with generics/interfaces, and covered with tests.

I've thoroughly reviewed several chapters (sorting, DP, graphs) and done a high-level pass on the rest. Currently in beta — corrections and contributions are welcome.

MIT licensed. Inspired by Wirth's "Algorithms and Data Structures", SICP, and CLRS.

Code and tests: https://github.com/amoilanen/Algorithms-with-Typescript

[1] https://zencoder.ai/zenflow